2020 Impact factor 3.043
Hadrons and Nuclei
Eur. Phys. J. A 1, 39-44

Study of the first-excited $K^{\pi}=0^{+}$ and 2+ bands in 228Th in the 226Ra$(\alpha,2n)$ reaction

T. Weber1 - J. Gröger1 - C. Günther1 - J. deBoer2

1 Institut für Strahlen- und Kernphysik, Universität Bonn, Nussallee 14-16, D-53115 Bonn, Germany
2 Sektion Physik, Universität München, Am Coulombwall 1, D-85748 Garching, Germany

Received: 11 August 1997 / Revised version: 19 September 1997 Communicated by D. Schwalm

Excited bands of 228Th were studied in the 226Ra$(\alpha,2n)$reaction by gamma-ray and conversion-electron spectroscopy. The first-excited $K^{\pi}=0^{+}$ and 2+ bands were identified up to $I^{\pi} = 12^{+}$ and 10+, respectively. The spin dependence of the moments of inertia is discussed. The experimental data indicate a structural change of these bands from 228Th to 230Th and 232Th.

21.10.Re Collective levels and giant resonances - 23.20.Lv Gamma transitions and level energies - 27.90.+b $220 \leq A$

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